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Alternative syntax for WebAssembly text format
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<title>Code coverage report for src/generator/array-subscript.js</title>
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<a href="../../index.html">All files</a> / <a href="index.html">src/generator</a> array-subscript.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// @flow
import opcode from '../emitter/opcode';
import mergeBlock from './merge-block';
import type { GeneratorType } from './flow/types';
import { TYPE_ARRAY } from '../semantics/metadata';
import mapSyntax from './map-syntax';
const generateArraySubscript: GeneratorType = (node, parent) => {
const identifier = node.params[0];
const isArray = identifier.meta[TYPE_ARRAY];
const block = node.params.map(mapSyntax(parent)).reduce(mergeBlock, []);
let type = node.type;
if (isArray != null) {
// For array types, the index is multiplied by the contained object size
block.push.apply(block, [
{ kind: opcode.i32Const, params: [2] },
{ kind: opcode.i32Shl, params: [] },
]);
type = isArray;
}
// The sequence of opcodes to perfrom a memory load is
// get(Local|Global) base, i32Const offset[, i32Const size, i32Mul ], i32Add
block.push({ kind: opcode.i32Add, params: [] });
block.push({
kind: opcode[String(type) + 'Load'],
params: [
// Alignment
2,
// Memory. Always 0 in the WASM MVP
0,
],
});
return block;
};
export default generateArraySubscript;
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